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Figure 1. Schematic diagram depicting the procedures for fabricating (ï¿½ï¿½) Ti₃C₂ MQDs and (ï¿½ï¿½) LbL assembly of TiO₂/(PDDA/MQDs)_n multilayered photoanodes.

Figure 2. SEM images of (a) TiO₂ NRAs, (b) TiO₂/(MQDs)₆, (d) TiO₂/(PDDA)₆ and (e) TiO₂/(PDDA/MQDs)₆; Cross-section SEM images of (c) TiO₂ NRAs and (f) TiO₂/(PDDA/MQDs)₆; (g-j) HRTEM images of TiO₂/(PDDA/MQDs)_n [n=1(g), 2(h), 4(i), 6(j)]; (k-q) TEM elemental mapping results of TiO₂/(PDDA/MQDs)₆ with (l) Ti, (m) O, (n) C, (o) N, (p) Cl and (q) F signals.

Figure 3. (a) XRD patterns (R: rutile, T: TiO₂, P: PDDA, M: MQDs); (b) FTIR; (c) Raman; (d) DRS results with (inset: sample photograph); (e) The transformed results of Kubelkaï¿½CMunk function vs. light energy based on the DRS results; high-resolution (f) Ti 2p and (g) O 1s spectra of (ï¿½ï¿½) TiO₂/(PDDA/MQDs)₆ and (ï¿½ï¿½) TiO₂ NRAs; high-resolution (h) C 1s, (i) N 1s, (j) Cl 2p and (k) F 1s spectra of TiO₂/(PDDA/MQDs)₆.

Figure 4. (a) LSV & (b) ABPE, (c) I-t responses (bias: 1.0 V vs. RHE), and (d) EIS results with equivalent circuit in the set; (e) M-S results & (f) charge carrier densities (N_D); (g) OCVD results & (h) electron lifespan (ï¿½ï¿½_n); and (i) IPCE results of TiO₂ NRAs, TiO₂/(MQDs)₆, TiO₂/(PDDA)₆ and TiO₂/(PDDA/MQDs)₆. All the PEC results were probed using aqueous Na₂SO₄ solution (0.5 M, pH = 7) as the electrolyte under simulated sunlight irradiation (AM 1.5G).

Figure 5. (a) Charge injection & (b) separation efficiency, (c) PL results, and photostability of (d) TiO₂/(MQDs)₆, (e) TiO₂/(PDDA)₆ and (f) TiO₂/(PDDA/MQDs)₆ utilizing aqueous Na₂SO₄ solution (0.5 M, pH = 7) as the electrolyte under continuous simulated sunlight irradiation (AM 1.5G); Interfacial charge transfer characteristics of (g) TiO₂/(MQDs)₆, (h) TiO₂/(PDDA)₆ and (i) TiO₂/(PDDA/MQDs)₆. Note:

: TiO₂ NRs;

: PDDA;

: Ti₃C₂ MQDs.

Figure 6. (a-d) LSV and (e-h) I-t results of TiO₂-based multilayered photoanodes with different stacking fashions under simulated sunlight irradiation (AM1.5G); (i-m) Schematic illustration of TiO₂-based multilayered photoanodes with different interface configuration. Note:

: PDDA;

: Ti₃C₂ MQDs.

Figure 7. Schematic diagram depicting the PEC water oxidation mechanism of TiO₂/(PDDA/MQDs)_n photoanodes.

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Õ“ï¿½ï¿½æœ½Ó£ï¿½https://onlinelibrary.wiley.com/doi/10.1002/adfm.202110848

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